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Earth, Planets and Space
Fig. 13 | Earth, Planets and Space

Fig. 13

From: Detection of hidden earthquakes after the 2011 Tohoku earthquake by automatic hypocenter determination combined with machine learning

Fig. 13

Precise hypocentral distribution off Kamaishi, Iwate Prefecture. a Hypocentral distribution of the merged catalog with events recalculated by the DD method with cross-correlation (1 March 2011–29 February 2012; 40–50 km depth; area indicated in Fig. 12a). The bottom panel is a cross-sectional view of earthquakes occurring within a rectangle in (a). Symbol colors indicate depth. b Magnitude-time diagram; red and gray circles are events in the JMA unified catalog and the merged catalog, respectively. c Cumulative number of events. Red stars indicate the repeating M ≥ 4.8 earthquakes (Uchida et al. 2015). Vertical blue dashed lines in (b) and (c) indicate the origin time of the 2011 Tohoku earthquake. (d) Normalized cumulative number of events over seven recurrences. The times immediately after the repeating M ≥ 4.8 earthquakes and immediately before the next one are represented by x = 0 and 1 on the horizontal axis, respectively. The M ≥ 4.8 repeating earthquakes are not included in the count

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